Loom bumper strap



March 7, 1950 s. D. LESESNE .LOOM BUMPER STRAP Filed Oct- 19, 1946 Juventor Sherman D. Lese um mess Herbs?! L Cove y attorney Patented Mar. 7, 1950 UNITED STATES 2,499,596 LOOM BUMPER STRAP Sherman D. Lesesn to Graton Mass., a corporation Application October 19, 1946, Serial No.

1 Claim.

uttle.

picker is slidably parallel with the hioning struck by the returning sh In one type of loom, the mounted on a rod arranged shuttle movement. buffer for cus condition to a required extent. remedy, the loom operator threads d at first, an

only part of (:1 when the objects will closure.

In accordance repeated service.

Referring to the dra preferable embodiment 1: illustrate a vention:

wings whic of this in e, W & Knigh orcester, Mass., asslgnor Worcester, etts 1; Company, of Massachus Fig. 1 is a fragmentary side elevation, partly in section, of e bumper strap mounted on the picker rod;

Fig. 2 is a when actuated by the picker the picker blow. The rubber thin to cause that expansion. would be too resilient, in that the picker to rebound. By cementing two or more layers of fabric together almost in contact, I provide the needed stiffness that distends the corrugation. The fabric bonding cement may also serve to secur the exterior faces of the inner layer to the leather pieces. When thus assembled, the strap as a unit has the needed stiffness, and the allowed to bend or soften as much as when used alone, because it is supported by the bonded fabric. On the other hand, the leather protects the fabric and receives all of the scumng action.

The leather strips may be secured to the rubberized fabric by various cements such as a standard cement used in the leather industry. I prefer a commercial or a synthetic rubber in a suitable solvent, or a nitrocellulose in an acetone solvent or vinylacetate or chloride dissolved in acetone. Various other elastomeric polymers may be employed as the cement; since their primary characteristic is to bond the fabric layers together as a body that will bend with enough stiffness to return bent. If desired, be secured together near their ends by the thread stitches 22 which strengthens the strap at this point. The strap dimensions may be widely varied, but it is preferred that each leather strip and the fabric layer be about inch thick. The strap may be 18 or 20 inches long and 1.5 inches wide. It may be bent to provide 3 or 4 waves or loops, as shown.

The bumper strap, as shown in Fig. 1, tends to assume the maximum expanded condition permited by the ends of the elongated slots engaging the rod It. When struck by the picker, the strap folds are moved towards each other or compressed to a limiting condition where the layers of the folds are in actual contact. The blow is absorbed gradually by this bending of the strap folds 23 or by the compression of the corrugated body. Then the stifiness or resiliency of the inner fabric layer serves to open up the folds of the strap and bring it back to its initial expanded sha The outer layers of leather receive the direct blow of the picker and the indirect pressure of the rearframe member 24 of the loom, and because of the elasticity of the leather absorb and transmit the blow without being injured or materially affected, except as the leather becomes softer under the impacts. The inner rubberized laminated fabric layer is not struck by the moving picker and t incorrugations after cement layer is too Also, rubber alone it would cause so is no jured. Hence it retains its natural resiliency for a very long life of service and will return the strap to its initial expanded condition at the desired rate.

The fabric is immobilized to a considerable extent by the rubber cement that impregnates leather is not and bonds the berized fabric layers together, so that the rubis stiff and not highly resilient. Hence it acts somewhat like a piece of new leather. This inner layer retains its characteristics for a long time, although the outer leather layers may become softened in time by the repeated blows. Hence, the strap continues to give the required cushioning service long after the leather layers have been materially softened or deadened and have but little of their initial resiliency left. The leather cooperates with the inner layer to protect it from the impact blow while this inner layer supplies the needed return of corrugation shape. It will be observed that the rubberized fabric is not intended to strengthen the leather body since tensile strength is not material, but that it serves as a supplemental cushioning and resilient medium when the strap is new and it provides the needed corrugation expansion after the leather has been softened by the blows.

I claim:

In a loom having a shuttle, a picker arranged to throw and receive the impact of the shuttle, a picker rod on which the picker slides and a frame member support for the rod, 9. loom picker bumper strap comprising an elongated, narrow laminated body having outside parallel layers of leather, and an inner, unitary strip of multiple layers of closely spaced rubberized fabric in which the fabric layers are bonded together by rubber as a stifiiy resilient spring strip, said leather layers and the inner strip having a series of spaced elongated holes threaded on the picker rod between the picker and the support and forming S-shaped compressible corrugation loops, the leather absorbing and protecting the stri from the picker blows and the strip loops resiliently resisting bending and serving to cushion the picker impact gradually and to urge the strap towards a straight condition and expand the loops after the impact irrespective of the condition of the leather layers.

SHERMAN D. LESESNE.

REFERENCES CITED UNITED STATES PATENTS Number Name Date 1,020,499 Henderson Mar. 19, 1912 1,375,841 Gusdorf Apr. 26, 1921 2,132,399 Cooper Oct. 11, 1938 2,149,568 Bacon Mar. '7, 1939 2,435,749 Lesesne Feb. 10, 1948 FOREIGN PATENTS Number Country Date 347,351 Great Britain Apr. 30, 1931 883,873 France Apr. 5, 1943 209,311 Switzerland June 1'1, 1940 

